function?[dispersionmeanw]?=?covw（xwvarargin）

%?[covaw?meanw]?=?covw（xwvarargin）
%
%???COVW?Covariance?matrix?with?weights.
%
%???COVW（WX）?if?X?is?a?vector?returns?the?variance.??For?matrices
%???where?each?row?is?an?observation?and?each?column?a?variable
%???COVW（XW）?is?the?variance-covariance?matrix.??DIAG（COVW（XW））?is
%???a?vector?of?variances?for?each?column?and?SQRT（DIAG（COVW（XW）））
%???is?a?vector?of?standard?deviations.?
%
%???Observations?are?weighted?with?vector?of?weights?W?which?has?all
%???nonnegative?values.??COVW（XW）?gives?the?weighted?estimate?of?the
%???variance-covariance?matrix.
%???
%???COVW（XW）?normalizes?by?（N-1）?where?N?is?the?number?of
%???observations.
%
%???COVW（XW1）?normalizes?by?N?and?produces?the?second
%???moment?matrix?of?the?observations?about?their?mean.
%???COVW（XW0）?is?the?same?as?COVW（XW）.
%
%???The?weighted?mean?is?removed?from?each?column?before?calculating?the
%???result.
%
%???See?also?COV?CORRCOEF?STD?MEAN.

%???J.?Little?5-5-86
%???Revised?6-9-88?LS?3-10-94?BJ
%???Copyright?1984-2002?The?MathWorks?Inc.?
%???$Revision:?5.16?$??$Date:?2002/06/05?17:06:38?$
%
%???Modified?for?weights
%???Allan?Aasbjerg?Nielsen
%???aa@imm.dtu.dk
%???10?Feb?2005

if?nargin<2?error（‘Not?enough?input?arguments.‘）;?end
if?nargin>3?error（‘Too?many?input?arguments.‘）;?end
if?ndims（x）>2?error（‘x?must?be?1-?or?2-D.‘）;?end
w?=?w（:）;?%?w?is?now?a?column?vector

[mn]?=?size（x）;

[mwnw]?=?size（w）;
if?length（x）==（m*n）
????x?=?x（:）;?%?x?is?now?a?column?vector
????[mn]?=?size（x）;
end
if?m~=mw?error（‘x?and?w?must?match.‘）;?end?
if?length（w（w<0））>0?error（‘Weights?must?be?nonnegative.‘）;?end

flag?=?0;
%?Check?for?covw（xw）?or?covw（xwflag）
if?（nargin==3）
????flag?=?varargin{end};
end

if?m==1??%?Handle?special?case
????dispersion?=?0;
else
????sumw?=?sum（w）;
????meanw?=?sum（repmat（w1n）.*x）?/?sumw;
????%xc?=?x?-?repmat（sum（repmat（w1n）.*x）m1）?/?sumw;??%?Remove?weighted?mean
????xc?=?x?-?repmat（meanwm1）;??%?Remove?weighted?mean
????%?direct?method?uses?way?too?much?memory:
????%dispersion?=?xc‘?*?diag（w）?*?xc?/?sumw;
????xc?=?repmat（sqrt（w）1n）?.*?xc;
????dispersion?=?xc‘?*?xc?/?sumw;
????if?flag==0
????????dispersion?=?m/（m-1）?*?dispersion;
????end
end

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????2311??2016-10-31?15:10??Change?Detection?Code\covw.m

?????文件???????1145??2016-11-01?16:35??Change?Detection?Code\createfigure.m

?????文件???????1314??2016-11-14?16:18??Change?Detection?Code\CVADemo.m

?????文件???????4272??2016-11-15?11:16??Change?Detection?Code\DAcom.m

?????文件??????35124??2016-10-28?20:04??Change?Detection?Code\data\major-TestROI.roi

?????文件?????960000??2012-04-25?09:29??Change?Detection?Code\data\Taizhou\2000TM

?????文件???????1376??2012-04-25?09:29??Change?Detection?Code\data\Taizhou\2000TM.HDR

?????文件?????960000??2012-04-25?09:28??Change?Detection?Code\data\Taizhou\2003TM

?????文件???????1376??2012-04-25?09:28??Change?Detection?Code\data\Taizhou\2003TM.HDR

?????文件??????35124??2016-10-28?20:04??Change?Detection?Code\data\Taizhou\major-TestROI.roi

?????文件?????160000??2016-10-31?17:01??Change?Detection?Code\data\Taizhou\TaizhouChange

?????文件????????923??2016-10-31?17:01??Change?Detection?Code\data\Taizhou\TaizhouChange.hdr

?????文件?????161078??2016-10-31?17:04??Change?Detection?Code\data\Taizhou\TaizhouChange_blackWhite.bmp

?????文件????????222??2016-10-31?17:04??Change?Detection?Code\data\Taizhou\TaizhouChange_blackWhite.bpw

?????文件?????161078??2016-11-02?10:26??Change?Detection?Code\data\Taizhou\TaizhouChange_blackWhite_unchange.bmp

?????文件????????222??2016-11-02?10:26??Change?Detection?Code\data\Taizhou\TaizhouChange_blackWhite_unchange.bpw

?????文件?????160000??2016-11-02?16:22??Change?Detection?Code\data\Taizhou\TaizhouChange_overall

?????文件????????993??2016-11-02?16:22??Change?Detection?Code\data\Taizhou\TaizhouChange_overall.hdr

?????文件????????247??2005-01-27?12:14??Change?Detection?Code\eigen2.m

?????文件???????2147??2016-10-28?20:30??Change?Detection?Code\enviwrite.m

?????文件???????2139??2016-10-29?17:40??Change?Detection?Code\enviwrite2.m

?????文件???????3433??2016-10-18?20:07??Change?Detection?Code\freadenvi.m

?????文件???????7071??2016-11-14?15:16??Change?Detection?Code\IRMAD_Update.asv

?????文件???????7275??2016-11-15?11:19??Change?Detection?Code\IRMAD_Update.m

?????文件????????881??2016-11-04?15:50??Change?Detection?Code\KmeansMap.m

?????文件???????4120??2016-11-15?11:15??Change?Detection?Code\MADGet.m

?????文件???????1683??2016-09-28?11:13??Change?Detection?Code\PCA.m

?????文件????????910??2016-11-14?16:19??Change?Detection?Code\PCADemo.m

?????文件?????541222??2016-11-01?16:34??Change?Detection?Code\Test?result\All?Bands?CCA?EigValues?Tendency?10?Iterations_Taizhou.bmp

?????文件???????9238??2016-11-01?16:34??Change?Detection?Code\Test?result\All?Bands?CCA?EigValues?Tendency?10?Iterations_Taizhou.fig

............此處省略65個文件信息